Don't try to GetPixelsForTesting if not testing

sky/viewer/internals.cc

Index: sky/viewer/internals.cc
diff --git a/sky/viewer/internals.cc b/sky/viewer/internals.cc
index 5edf79affc691598f4274f8550c0ada50d0d28a1..01cf5db3bf5566ddbd033d531033b29649eb2030 100644
--- a/sky/viewer/internals.cc
+++ b/sky/viewer/internals.cc
@@ -14,6 +14,7 @@
 #include "sky/engine/public/web/WebFrame.h"
 #include "sky/engine/public/web/WebView.h"
 #include "sky/viewer/document_view.h"
+#include "sky/viewer/runtime_flags.h"
 #include "v8/include/v8.h"
 #include <limits>
 
@@ -72,6 +73,8 @@ std::string Internals::ContentAsText() {
 }
 
 void Internals::NotifyTestComplete(const std::string& test_result) {
+  if (!RuntimeFlags::Get().testing())
+    return;
   std::vector<unsigned char> pixels;
   document_view_->GetPixelsForTesting(&pixels);
   test_harness_->OnTestComplete(test_result,